I don’t know what to think?

So my friend and I(we weren’t dating) I snuck him into my moms house. We talked for a while and then he started kissing me, it went really far so yes we had sex. It was off and on through the night and we didn’t have a condom!! He said he didn’t pre cum neither cum. I felt so much guilt after he left, I was getting ready for school the next day and I didn’t feel good at all, I couldn’t eat breakfast, my mom was driving me to school and I started crying and saying I didn’t feel good ( I was also up until 5am and only got an hour of sleep) so she said ok and dropped me off at home, I got home and lied on the couch and started crying, than soon fell asleep. I had slept all day and still felt tired. My mom got home and started making supper that I couldn’t eat because I wouldn’t eat anything. I went to sit on the couch and started bailing, she said what’s wrong and I couldn’t stop crying, I started saying “ you’re going to hate me” over and over again. Then I finally told her I snuck a boy in and we had sex, she was speechless she had no words for me, she asked if we used a condom and I said no. At that point I knew she was scared for me. She said the reason I didn’t feel good was because I was guilty and had regret. I was suppose to get my period the next day but I didn’t come. About a week went by and I finally got my period, 🙏🙏 My cycle has been a little bit bumpy but I still only have my period for about 5-6 days it’s been 2 months and a day since I’ve lost my virginity and I honestly feel so weird still but I can’t be pregnant because I’ve had my period, can someone help me!! I think I still have regret and guilt but I don’t know. I feel like crying when I think about it to much!! I’m only 13 years old does that make me a slut?!